![]() The retractable dog on the free trolley can be engaged and disengaged through the use of a blade-type stop mechanism, or by the mechanical reaction of the load carrying trolley accumulating on a trailing trolley in the free track. Power is then transmitted to the free trolley. This retractable dog engages a dog which is integral to the power chain. ![]() In a P&F conveyor system, force is applied to the free load-carrying trolley via a retractable dog, which is integral to the front free trolley. The powered chains are typically drop-forged rivet less – link type (such as X-458 or X-678). A power and free (P&F) conveyor consists of a continuously-moving powered chain, which when engaged, moves a free (non-powered) load-carrying trolley through the conveyor system.
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